# User:Tohline/Appendix/CGH/Overview

Jump to navigation Jump to search

# CGH: Philosophical Overview

 |   Tiled Menu   |   Tables of Content   |  Banner Video   |  Tohline Home Page   |

## Slit Diffraction

### Single Aperture

Figure 1

As has been detailed in an accompanying discussion, we consider, first, the amplitude (and phase) of light that is incident at a location $~y_1$ on an image screen that is located a distance $~Z$ from a slit of width $~w = (Y_1 - Y_2) = 2c$. The amplitude is given by the expression,

 $~A(y_1)$ $~=$ $~\sum_j a_j \biggl[ \cos\biggl(\frac{2\pi D_j}{\lambda} + \phi_j \biggr) + i \sin\biggl(\frac{2\pi D_j}{\lambda} + \phi_j \biggr) \biggr] \, ,$

where,

 $~D_j$ $~=$ $~ L \biggl[1 - \frac{2y_1 Y_j}{L^2} + \frac{Y_j^2}{L^2} \biggr]^{1 / 2} \, ,$

and,

 $~L$ $~\equiv$ $~ [Z^2 + y_1^2 ]^{1 / 2} \, .$

Notice that, in the definition of $~D_j$, the expression inside the square brackets involves a term that depends quadratically on the dimensionless length scale, $~Y_j/L$, as well as a term that depends linearly on this ratio. As discussed below, our expression for the amplitude simplifies nicely in situations where the quadratic term can be ignored. Via a related simplification, we will find that the various natural lengths of this problem are can be related via the expression,

 $~y_1\biggr|_{1^\mathrm{st} \mathrm{fringe}}$ $~\approx$ $~\frac{\lambda Z}{w} \, .$

# See Also

 © 2014 - 2021 by Joel E. Tohline |   H_Book Home   |   YouTube   | Appendices: | Equations | Variables | References | Ramblings | Images | myphys.lsu | ADS | Recommended citation:   Tohline, Joel E. (2021), The Structure, Stability, & Dynamics of Self-Gravitating Fluids, a (MediaWiki-based) Vistrails.org publication, https://www.vistrails.org/index.php/User:Tohline/citation